Gerald,
the JT65/FT8 move is a good point. If you have a WSJTX/FT8 setup running successfully (RX/TX), MSK144 should also run. After thinking it over I am almost sure that the limiting factor in my set up wasn’t the cheapo external soundcard*. Any portable computer from the past 15 years should do. If WSJTX runs. If you look at sthe specs, any sound card from the early 2000’s onwards has had a sampling frequency of 48 kHz or more. Plenty to decode a signal containing frames of 0.072 s duration.
What I want to say is, don’t worry too much about the hardware. Except the worries are about schlepping an old weighty laptop up the summit. 
*.I connected the sound card to the tablet computer using a micro usb hub. It is much more likely that the micro usb hub is the faulty part rather than the external sound card. I will replace the hub by a discrete adaptor and see if I can find a local FT8 vhf station willing to do some tests with me in MSK144.
@F5LKW
Roger,
thank you, listening to your QSO’s I recall a meteor storm in the late 1990’s. I intended to operate portably but the finals of my IC-706 blew the weekend before the storm. Giving the rig to the local radio store for a fix, he lend me a new and shiny FT-847 for a few days to be QRV during the storm. Shame I dind’t dare to take it out for a portable activation. So I sat at home in the shack with a 4 ele yagi in the attic instead of being on a hill. I didn’t manage to make a single QSO but what I heard over hours was overwhelming and more like sporadic E than MS.
Ahoi
Pom